(RE-1497) Remove quantal from build_defaults

This commit removes quantal from all build defaults because it is end of
life. It removes the defaults from the build_defaults yaml.
Merge pull request #2794 from clantant/RE-1497/master/srcs

(RE-1497) Remove quantal from build_defaults
Merge branch 'master' of https://github.com/puppetlabs/puppet